Folding saw-frame.



A. LUZZATTI.

FOLDING SAW FRAME.

APPLICATION FILED 00125, 1907.

923,543, v Patented June 1,1909.

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4/ wwwr/Ww A, LUZZATTI. FOLDING SAW FRAME. LPPFICATI'ON FILED OCT. 25,1907. 923,543. 7 Patented June 1, 1909.

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ARTURO LUZZATTI, OF RAVENNA, ITALY.

FOLDING SAW-FRAIWE Application filed October 25, 1907.

Tea whom it may concern:

Be it known that I, subject of the King of Italy, residing at Ravenna,in the Kingdom of Italy, have invented a new and useful Saw in which aToothed Blade is Mounted in a Folding Frame, of which the following is aspecificatlon.

The present invention relates to an im proved construction of a framesaw of the kind in which the blade is mounted in a folding frame. Thesaw may be made of any suitable dimensions for use as a one or twohandedsaw, or as a bench saw actuated in any convenient way, according to thenature of the Work it is to do. The characteristic feature of thepresent lnvention consists in the construction and arrangement of thethree principal parts, namely, the blade, the brace bar, and the tensiondevice, so that when taken apart the saw may be packed conveniently fortransport. When in use the saw blade is stretched in its frame undersuitable tension, while when not in use it can be packed up into aminimum space, with the blade perfectly protected without necessitatinga sheath, which is of special importance in its applications formilitary purposes, as also when it is employed by Alpine climbers,cyclists, motorists, wood cutters, carpenters, joiners, etc.

One form of construction of the saw is shown by way of example in theaccompanying drawing.

Figure 1 shows the saw dismounted and folded up for transport. Fig. 2shows the saw stretched and arranged for use. Figs. 3 to 10 are detailviews hereinafter referred to.

Referring to the drawings, 1 is the saw blade, 2 are the supports forthe latter, 3 is the brace bar, and 4 is the screw tension de vice. Eachend of the blade 1 is connected by a screw or pin 5 to a rod 6 engagingin a slot formed in one of the supports 2, Figs. 2 and 10. The rod 6 hasa head 7 which engages against the face of the recessed portion in thesupport 2. The screw 5 may be easily removed for the replacement of theblade in case of necessity. Each rod 6 can slip freely in the slot ofits support, but it cannot come out therefrom. In this way the blade 1,the rods 6 and the supports 2 form three linked members, seen spread outin Fig. 7.

The inner shoulder of each head piece 7 may be toothed or roughened inany con- Specification of Letters Patent.

Patented June 1, 1909.

Serial No. 399,188.

lvenient way so as to cause it to engage ARTURO LUZZATTI, a 1 against acorresponding roughened surface forming the base of the depressionwherein the head lies; in this way all movement of rotation of the saw 1when stretched will be prevented.

In the inner face of each of the supports 2, which are usually of wood,formed in the manner well known in carpenters saws, a longitudinalgroove 8 (Fig. 8) is formed to a certain depth, and these grooves servein combination with a groove 9 on the brace bar 3 (Fig. 5) to form aclose casing for the blade 1 whichever way the toothed edge of the blademay be directed when the saw is folded up in the position for transport,Fig. 1. In the supports, slots are formed in a convenient position asshown at 10 for receiving spigots or projecting pieces 13 on the bracebar, the arrangement being the same at each end. The outer face of eachof the supports is usually concaveand is provided at one place with ametal clasp 11. The brace bar 3 is usually formed of a piece of wood ofsufficient strength. The groove 9 formed in one face of the bar as abovedescribed is terminated at each end by a slot 12, (Fig. 5,) serving toreceive a corresponding end of the pieces 6 when the saw is folded up.At the other side of the brace bar 2 angle pieces 18 usually of metalare supported preferably by being let into the wood and fixed by meansof screws. These angle pieces serve as catches for the loops of thetension device when the saw is folded up, Fig. 1.

The tension device is formed of metal and comprises two rods 14 screwthreaded at one end and engaging the sleeve 15 internally threaded withright and left hand screws. The other ends of the rods are formed witheyelets 16 in which loops 17 are engaged. The tension is adjusted byturning the sleeve 15 in one direction or the other, as will be wellunderstood, the drawing together of the rods 14 serving to pull togetherthe tops of the supports 2, thus tensioning the blade and making thewhole saw ready for use.

What I claim is:

A folding frame saw comprising in combination a blade, short linkedrods, each at one end pivotally attached to one end of said blade,enlarged heads on the other ends of said rods, supports adapted toengage the headed rods, and slotted and grooved to receive the bladewhen the saw is folded up; ends 17 of the tension device passed over thea brace bar detachably secured to the said l ends of the supports andabutting against supports and a detachable adjustable tenprojections 18on the brace bar. sion device adapted to engage the other ends Inwitness whereof I have hereunto set 5 of1 said supports; tlge ivligledficolinbbined that my hand in presence of two witnesses.

t e supports can e 'o e ac y means r w of the linked rods, upon one sideof the saw AR FURO LULAATTI' blade, the detachable brace bar formingVitnesses: therewith a sheath for the saw-blade, and LEOPOLDO DURANDO,

10 the whole be secured together by the looped EGIDIo A. LARAIA DI RoccoLARAIA.

